Can anyone help with little diet plan?

I know it is a slim chance, but I Would love to get a bit fitter. I am 160lbs and 5'7. Usually eat every meal, excersise by walking only so far (around 3 miles a day)..

My goal is to get rid of around 22lbs by the end of this year..

Anyone here who could give me some basic tips about food and excersise? At least how much calories I should take in and how much/often work out?
Can anyone help with little diet plan?
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